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Title: Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation

This letter presents the concept of the Total Internal Reflection metasurface (TIR-MS) which supports the realization of structure-embedded subwavelength acoustic shields for elastic waves propagating in thin waveguides. The proposed metasurface design exploits extreme phase gradients, implemented via locally resonant elements, in order to achieve operating conditions that are largely beyond the critical angle. Such artificial discontinuity is capable of producing complete reflection of the incoming waves regardless of the specific angle of incidence. From a practical perspective, the TIR-MS behaves as a sound hard barrier that is impenetrable to long-wavelength modes at a selected frequency. The TIR metasurface concept is first conceived for a flat interface embedded in a rectangular waveguide and designed to block longitudinal S 0-type guided modes. Then, it is extended to circular plates in order to show how enclosed areas can be effectively shielded by incoming waves. Given the same underlying physics, an equivalent dynamic behavior was also numerically and experimentally illustrated for flexural A 0-type guided modes. This study shows numerical and experimental evidence that, when the metasurface is excited at the target frequency, significant vibration isolation can be achieved in the presence of waves having any arbitrary angle of incidence. Furthermore, these resultsmore » open interesting paths to achieve vibration isolation and energy filtering in certain prototypical structures of interest for practical engineering applications.« less
Authors:
 [1] ;  [2] ;  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND-2018-9065J
Journal ID: ISSN 0003-6951; 667160
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 22; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING
OSTI Identifier:
1487421

Zhu, Hongfei, Walsh, Timothy F., and Semperlotti, Fabio. Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation. United States: N. p., Web. doi:10.1063/1.5052538.
Zhu, Hongfei, Walsh, Timothy F., & Semperlotti, Fabio. Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation. United States. doi:10.1063/1.5052538.
Zhu, Hongfei, Walsh, Timothy F., and Semperlotti, Fabio. 2018. "Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation". United States. doi:10.1063/1.5052538.
@article{osti_1487421,
title = {Total-internal-reflection elastic metasurfaces: Design and application to structural vibration isolation},
author = {Zhu, Hongfei and Walsh, Timothy F. and Semperlotti, Fabio},
abstractNote = {This letter presents the concept of the Total Internal Reflection metasurface (TIR-MS) which supports the realization of structure-embedded subwavelength acoustic shields for elastic waves propagating in thin waveguides. The proposed metasurface design exploits extreme phase gradients, implemented via locally resonant elements, in order to achieve operating conditions that are largely beyond the critical angle. Such artificial discontinuity is capable of producing complete reflection of the incoming waves regardless of the specific angle of incidence. From a practical perspective, the TIR-MS behaves as a sound hard barrier that is impenetrable to long-wavelength modes at a selected frequency. The TIR metasurface concept is first conceived for a flat interface embedded in a rectangular waveguide and designed to block longitudinal S0-type guided modes. Then, it is extended to circular plates in order to show how enclosed areas can be effectively shielded by incoming waves. Given the same underlying physics, an equivalent dynamic behavior was also numerically and experimentally illustrated for flexural A0-type guided modes. This study shows numerical and experimental evidence that, when the metasurface is excited at the target frequency, significant vibration isolation can be achieved in the presence of waves having any arbitrary angle of incidence. Furthermore, these results open interesting paths to achieve vibration isolation and energy filtering in certain prototypical structures of interest for practical engineering applications.},
doi = {10.1063/1.5052538},
journal = {Applied Physics Letters},
number = 22,
volume = 113,
place = {United States},
year = {2018},
month = {11}
}

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